KR20220114000A - Switching method and device in sidelink relay architecture - Google Patents

Abstract

An embodiment of the present application provides a switching method and apparatus in a sidelink relay architecture that solves a problem that a remote terminal in the sidelink relay architecture cannot perform switching, resulting in service interruption. The method is executed by a remote terminal; receiving a first message from a network device, the first message including switching information; and switching from a source link to a target link according to the switching information, wherein at least one of the source link and the target link is a relay link.

Description

Switching method and device in sidelink relay architecture

An embodiment of the present application relates to a communication field, and more particularly, to a switching method and apparatus in a sidelink relay architecture.

<Cross Citation>

This application claims the priority of the Chinese patent application filed with the Chinese Patent Office on March 25, 2020, the application number is 202010219518.X, and the title of the invention is "Switching method and apparatus in sidelink relay architecture", in this application All contents of this application are cited.

The Long Term Evolution (LTE) system starts to support sidelink from the 12th release version, so that data transmission between terminal devices is performed directly without going through a network device.

With the development of sidelink, a sidelink relay scenario has been presented in the related art. In a typical sidelink relay scenario, a remote terminal device (remote UE, or abbreviated as "remote terminal") relays via a sidelink (or relay link) with a relay terminal device (relay UE, or abbreviated as "relay terminal") The terminal transmits its data to the network device. In the corresponding sidelink relay scenario, data transmission is performed between a remote terminal and a network device, and the relay terminal serves as a data relay.

In the related art, the design of the switching of the remote terminal in the sidelink relay architecture is not carried out, the related method is lacking, and the switching process of the Uu interface cannot be directly applied to the remote terminal, so that the remote terminal cannot proceed with normal switching, The user experience is degraded due to service interruption.

An object of the present application is to provide a switching method and apparatus in a sidelink relay architecture for solving a problem that a remote terminal in a sidelink relay architecture cannot perform switching, resulting in service interruption.

In a first aspect, it is executed by a terminal device; receiving a first message from a network device, the first message including switching information; Switching from a source link to a target link according to the switching information, wherein at least one of the source link and the target link is a relay link;

In a second aspect, it is executed by a network device; sending a first message comprising switching information; The switching information is for instructing the terminal device to switch from a source link to a target link, and at least one of the source link and the target link is a relay link.

In a third aspect, it is executed by the relay terminal device; receiving a second message from the network device, the second message including reset information; and performing at least one of adding a sidelink interface setting, deleting a sidelink interface setting, and resetting a Uu interface based on the reset information.

In a fourth aspect, a receiving module for receiving a first message from a network device, the first message including switching information; and a link switching module that switches from a source link to a target link according to the switching information, wherein at least one of the source link and the target link is a relay link.

In a fifth aspect, there is provided a sending module for sending a first message including switching information; The switching information is for instructing the terminal device to switch from a source link to a target link, and at least one of the source link and the target link is a relay link.

In a sixth aspect, the receiving module receives a second message from the network device, the second message including reset information; and a configuration update module configured to perform at least one of adding a setting of a sidelink interface, deleting a setting of a sidelink interface, and resetting a Uu interface, based on the reset information.

In a seventh aspect, a side according to any one of the first and third aspects, comprising a processor, a memory and a computer program stored in the memory and executable by the processor, wherein the computer program is executed by the processor. A terminal device in which a switching method in a link relay architecture is implemented is provided.

In an eighth aspect, the switching method in the sidelink relay architecture according to the second aspect is implemented, comprising a processor, a memory and a computer program stored in the memory and executable by the processor, wherein the computer program is executed by the processor It provides a network device that can be

In a ninth aspect, a computer readable storage medium storing a computer program that, when executed by a processor, implements a switching method in a sidelink relay architecture according to any one of the first, second and third aspects; to provide.

In an embodiment of the present invention, the network device to which the remote terminal belongs may transmit switching information, and the remote terminal performs switching according to the switching information to complete the switching process, thereby securing service continuity, system performance and user experience. further improve

The drawings described herein are intended to help a further understanding of the present application, and are part of the present application, and exemplary embodiments of the present application and a description thereof are only for explaining the present application, and limiting the present application not for
1 is an exemplary flowchart of a switching method in a sidelink relay architecture according to an embodiment of the present application.
2 is an exemplary flowchart of a switching method in a sidelink relay architecture according to another embodiment of the present application.
3 is an exemplary flowchart of a switching method in a sidelink relay architecture according to another embodiment of the present application.
4 is a structural schematic diagram of a terminal device according to an embodiment of the present application.
5 is a structural schematic diagram of a network device according to an embodiment of the present application.
6 is a structural schematic diagram of a terminal device according to another embodiment of the present application.
7 is a structural schematic diagram of a terminal device according to another embodiment of the present application.
8 is a structural schematic diagram of a network device according to another embodiment of the present application.

In order to make the purpose, technical solution and advantages of the present application more clear, a clear and complete description of the technical solution of the present application will be proceeded with reference to the specific examples and corresponding drawings of the present application below. It is obvious that the described embodiments are only some examples and not all examples. Based on the embodiments of the present application, it should be said that all other embodiments that those skilled in the art can obtain without creative efforts are all within the scope of the present application. In each embodiment of the present specification, “and/or” indicates at least one of both before and after.

Technical solutions of the embodiments of the present application are various communication systems, for example, Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD) ) system, Universal Mobile Telecommunication System (UMTS), or Worldwide Interoperability for Microwave Access (WiMAX) communication system or 5G system, or New Radio (NR) system, LTE It will be appreciated that it may be applied to a sidelink system, an NR sidelink system, or a subsequent enhanced communication system.

In an embodiment of the present application, a terminal device includes a mobile station (MS), a mobile terminal, a mobile phone, a user equipment (UE), a handset, and a portable device. equipment), vehicle, etc. are included, but are not limited thereto, and the corresponding terminal device can communicate with one or more core networks through a Radio Access Network (RAN), for example, a terminal. The device may communicate with one or more core networks through a Radio Access Network (RAN). For example, the terminal device may use a mobile phone (or called a “cellular” phone), a wireless communication function. It may be a computer, etc. with

In an embodiment of the present application, a network device is a device that is disposed in a radio access network to provide a wireless communication function for a terminal device. The network device may be a base station, and the base station may include various types of macro base stations, micro base stations, relay stations, access points, and the like. In systems using different radio access technologies, the names of devices equipped with base station functions may be different. For example, in an LTE network, called an Evolved NodeB (eNB, or eNodeB), in a 3rd Generation (3G) network, a Node B (Node B), in a 5G system, a Next-generation Node B (gNB) , or a network device in a subsequent enhanced communication system, etc., but the use of the term is not intended to be limiting.

Hereinafter, an implementation idea of the embodiments of the present application will be introduced. As described above, a typical sidelink relay scenario includes a remote terminal device (abbreviated as remote UE, or “remote terminal”) and a relay terminal device (abbreviated as relay UE, or “relay terminal” for short). In the remote terminal under the layer 2 (L2) sidelink relay architecture, when the remote terminal is in a connected state, the serving cell/base station of the relay terminal is its own serving cell/base station, or the primary cell (Pcell) of the relay terminal It may be a serving cell of a remote terminal. Optionally, the serving cell of the remote cell may also be another cell different from the serving cell of the relay terminal under the relay terminal serving base station.

The core of the L2 sidelink relay architecture is a layer 3 protocol layer corresponding to a remote terminal, for example, a radio resource control (RRC) layer, a packet data convergence protocol (PDCP) layer, etc. 3 The protocol stack is located on the side of the network device (eg, base station). Between the remote terminal and the relay terminal, only some layer 2, layer 1 protocol stack, for example, Radio Link Control (RLC), Medium Access Control (MAC) layer, Physical (PHY), etc. only exists, data relaying, and control functions and safety functions related to the remote terminal are all located on the network device side.

Based on the above introduction, the serving cell may change the path of the remote terminal by performing switching by controlling the remote terminal. In order to implement switching of a remote terminal, as shown in FIG. 1 , an embodiment of the present application provides a switching method 100 in a sidelink relay architecture, the method can be executed by a terminal device, In other words, the method can be executed by software or hardware installed in the terminal device, and the method includes the following steps.

S102: Receive a first message from the network device, the first message including switching information.

The embodiment may be performed by a terminal device; The terminal device may be directly connected to the network device, and in this embodiment, the terminal device is switched from the Uu link directly connected to the network device to the relay link connected to the relay terminal.

The terminal device may also be a remote terminal, and in this example, the terminal device is switched from the relay link connected to the relay terminal to the Uu link directly connected to the network device; Alternatively, the corresponding terminal device is switched from a relay link connected to the relay terminal to another relay link connected to the relay terminal.

The first message may be a reconfiguration message, for example, an RRCReconfiguration message. The first message includes switching information, for example, the switching information may be mobilityinfo or the like.

S104: Switching from the source link to the target link according to the switching information, wherein at least one of the source link and the target link is a relay link.

In this embodiment, the terminal device may be switched from the relay link to the Uu link according to the switching information; It can also be switched from a Uu link to a relay link; It can also be switched from a relay link to a relay link.

In one example, the terminal device is switched from the first relay link to the first Uu link according to the switching information, and the first relay link and the first Uu link connect the same network node (network device, serving cell, serving base station, etc.) may belong to, and may belong to different network nodes.

In another example, the terminal device is switched from the second Uu link to the second relay link according to the switching information, and the second relay link and the second Uu link may belong to the same network node and may be connected to different network nodes. may belong

In another example, the terminal device is switched from the third relay link to the fourth relay link according to the switching information, and the third relay link and the fourth relay link may belong to the same network node, and may also belong to different network nodes. may belong to

Optionally, after the terminal device is switched from the source link to the target link, it may also send a completion message for the first message to the network device, wherein the completion message is for indicating that the terminal device has completed switching . In this embodiment, if the target link after switching is a Uu link, the terminal device directly sends a completion message to the target network device; If the target link after switching is a relay link, the terminal device transmits a completion message to the target relay terminal, and the target relay terminal transmits the completion message to the network device.

In the switching method in the sidelink relay architecture provided by the embodiment of the present invention, the network device to which the remote terminal belongs may transmit switching information, and the remote terminal performs switching according to the switching information to complete the switching process, resulting in service continuity to further improve system performance and user experience.

Optionally, after a terminal device, for example, a remote UE (Remote UE) establishes a connection with its serving cell/base station, the serving cell performs measurement setup with respect to the terminal device, so that the terminal device performs measurement settings for the terminal device and/or its surrounding cells and/or Alternatively, the relay terminal performs measurement and reports a measurement report when the reporting condition is satisfied.

In one example, before receiving the first message from the network device in the embodiment 100, the method includes: receiving measurement setting information; The method further includes performing measurement reporting according to the measurement setting information.

Optionally, the measurement configuration information is for instructing the terminal device to measure at least one of the following 1) to 4), that is, 1) a signal quality of a current serving cell; 2) the signal quality of a potential cell other than the serving cell, that is, the terminal device may be switched into the corresponding potential cell, and the corresponding potential cell is a neighboring cell of the serving cell; 3) link quality with the relay terminal of the current service; 4) Link quality with the potential relay terminal, the terminal device may switch the relay link established with the corresponding potential relay terminal.

Optionally, the measurement configuration information instructs the terminal device to measure the link quality with the potential relay terminal in 4), whereby, before performing measurement reporting according to the measurement configuration information, the method includes 1) and 2) further comprising at least one of the two steps.

1) A broadcast message is received from the potential relay terminal, and the broadcast message is for instructing the potential relay terminal to support providing a relay service.

In this example, the potential relay terminal actively transmitting the broadcast message indicates that it supports providing relay services to other UEs. Optionally, the corresponding broadcast message may also include supporting service information, that is, the potential relay terminal may broadcast service information capable of supporting the relay itself.

2) transmitting a request message, the request message is for requesting a relay terminal providing a relay service; Receiving a response message from the potential relay terminal, the response message is for instructing the potential relay terminal to support providing a relay service.

In this example, the terminal device (remote terminal) broadcasts a message to the surroundings to inquire which relay terminal can provide the relay service for it, and a potential relay terminal with the ability proceeds with a response, so that the remote terminal to inform that it supports providing relay service. Optionally, the request information transmitted by the terminal device may also include service information, and only the potential relay terminal supporting the provision of the relay service for the service (corresponding to the service information) proceeds with a response.

Optionally, measuring the link quality with the above-mentioned potential relay terminal includes measuring the link quality with the potential relay terminal according to at least one of 1) to 4) below, that is, 1) the broadcast cast message; 2) the request message; 3) the response message; 4) It is a reference signal from the potential relay terminal.

Optionally, when there are a plurality of potential relay terminals, the potential relay terminal reported by the terminal device includes: 1) a potential relay terminal having the best link quality among the plurality of potential relay terminals; or 2) a potential relay terminal capable of providing a preset service request, for example, a large bandwidth, low delay, etc. service request; or 3) a potential relay terminal having a related relationship with the terminal device, and the related relationship is, for example, a binding relationship established between the user's wearable device and the corresponding user's mobile phone.

Optionally, to proceed with measurement reporting according to the measurement setting information mentioned in each embodiment, reporting is carried out when at least one of the following 1) to 9) is satisfied, that is,

1) that the measurement result of the relay terminal of the serving cell or the current service is higher than the first threshold (the first threshold corresponding to the serving cell and the first threshold corresponding to the relay terminal may be different will understand);

2) that the measurement result of the relay terminal of the serving cell or the current service is lower than a second threshold;

3) that the measurement result of the potential relay terminal is higher than that of the current service plus the offset plus the measurement result of the relay terminal;

4) the measurement result of the potential cell or the potential relay terminal is higher than a third threshold;

5) that the measurement result of the serving cell is lower than the fourth threshold, and that the measurement result of the potential relay terminal is higher than the fifth threshold;

6) that the measurement result of the relay terminal of the current service is lower than the sixth threshold, and that the measurement result of the potential relay terminal or the potential cell is higher than the seventh threshold;

7) the measurement result of the potential cell of the cross radio access technology (RAT) or the potential relay terminal of the cross RAT is higher than an eighth threshold;

8) that the measurement result of the serving cell is lower than the ninth threshold, and the measurement result of the cross-RAT potential relay terminal is higher than the tenth threshold;

9) The measurement result of the relay terminal of the current service is lower than the eleventh threshold, and the measurement result of the potential relay terminal of the cross-RAT or the potential cell of the cross-RAT is higher than the twelfth threshold.

It should be explained that all of the first to twelfth thresholds mentioned in the embodiment may be the same, and some may be the same and some may be different.

Optionally, in embodiment 100, the terminal device also receives PDCP resetting indication information; According to the PDCP reset indication information, a safety reset and a head compression reset may be performed.

Optionally, in embodiment 100, the terminal device also receives PDCP recovery indication information; According to the PDCP recovery indication information, a data recovery related operation may be performed.

In the above two embodiments, if the status reporting function is set in the Acknowledged Mode (AM), the method includes: sending a first status report; The method further includes retransmitting a packet that has not been successfully transmitted in the source link according to the received second status report.

Optionally, embodiment 100 includes: deleting RLC entity settings; Deleting the MAC layer and source link correlated settings; The MAC layer and the source link further include at least one of stopping a correlated timer.

In order to describe in detail the switching method in the sidelink relay architecture provided by each of the embodiments of the present application, it will be introduced with reference to several specific embodiments below.

Example 1: Measurement setup

In this embodiment, when one UE is directly connected to the serving cell or connected to the serving cell through a relay UE, the serving cell is the UE's capability information (eg, whether it supports cross-carrier capability), or tendency By information (eg want to save energy, want more to connect to relay link, etc.), or request information (eg want to save energy, more want to connect to Uu link, etc.), For this purpose, you can configure the measurement settings related to sidelink relay path switching.

In the remote UE connected to the serving cell through the relay UE, the serving cell clearly knows that it is one remote UE through information and / or route information during signaling, and also knows the relay UE node corresponding to the remote UE, Optionally, after inquiring the remote UE capability/propensity/request, etc., a measurement configuration is set for the remote UE, so that the next step switching selects a target node (which may be a network node or a relay terminal) .

In the UE of the serving cell directly connected to the serving cell, the serving cell may inquire the capability/propensity/request of the corresponding UE, and may set a measurement configuration for this purpose, for example, by transmitting measurement configuration information , let the next step switching select the target relay node.

Optionally, the UE measurement configuration mainly includes at least one of 1) to 4), that is,

1) the signal quality of the current serving cell of the UE (the UE is directly connected to the serving cell, and/or the remote UE is relay connected to the serving cell through a relay UE), the corresponding signal quality is, for example, the reference signal reception power (RSRP ), reference received signal reception quality (RSRQ), and the like.

In this example, the UE may be configured with periodic reporting or event-triggered reporting, where the event trigger may set a threshold of measurement, if the serving cell RSRP is lower than the threshold 1, or the serving cell RSRP is higher than the threshold 2 , both can trigger measurement report reporting.

2) The UE measures the signal quality of other non-serving cells (abbreviated as "other potential cells"), for example, RSRP, RSRQ, and the like.

In this example, the UE may be set to periodic reporting or event-triggered reporting, where the event trigger may set a threshold of measurement, for example, the RSRP of the potential cell is higher than the threshold 1, or the potential cell If the RSRP is higher than the RSRP of this cell plus the offset, both may trigger a measurement report reporting.

3) Link quality measurement between the remote UE and the relay UE of the current service.

In this example, the remote UE may be configured with periodic reporting or event trigger reporting, where the event trigger may, for example, set a measurement threshold, and if the link quality between the remote UE and the current relay UE is lower than the threshold, Trigger measurement reporting.

Considering that the communication and measurement between the UE and the UE are different from the Uu link of the general base station, if a similar periodic reference signal is used for the measurement, the UE can measure the signal to obtain a continuously stable measurement result, but In order to save and reduce interference, a periodic reference signal is generally transmitted between the UEs, which is not used for professional measurement. If there is no data transmission to the UE in the measurement period, the measurement value proceeds with a measurement process, for example, does not update the measurement value, uses the measurement value of the previous period, or performs special reporting; For example, periodic reporting, there is no measurement value in this period, and reporting null directly.

4) The UE measures the link quality between other potential relay UEs.

In this example, the remote UE may be configured with event-triggered reporting, for example, reporting that the link quality between other potential relay UEs and higher than the threshold is higher than the threshold, or the link quality between other potential relay UEs and the current service Relay Reporting when higher than the UE quality plus the offset, etc.

In general, a method for the UE to measure the surrounding potential relay UE is as follows.

First, the UE must clearly know that the counterpart relay UE is a UE that has a relay function and can also provide a relay function for itself. There are two methods for acquiring information, one is a method in which the relay UE actively broadcasts information, and broadcasts to the surroundings to indicate that it supports the relay service of other UEs; The other is a request method from the remote UE. The remote UE broadcasts to the surroundings, inquires who can provide the relay service for itself, and the relay UE with the capability proceeds with a response, and sends itself to the remote UE. Notifies that this relay service can be provided.

After determining that the function supports it, it is then determined whether the link between the remote UE and the corresponding relay UE satisfies the communication requirement, and through signal detection and measurement of the response or broadcast process, the link between the remote UE and the relay UE is By completing the initial measurement or by continuously monitoring the signal (eg, measurement reference signal or data reference signal) transmitted by the relay UE by the remote UE, the link quality is further checked. In general, the link quality between the remote UE and the relay UE should satisfy the minimum threshold requirement, and on this basis, the remote UE selects an appropriate one from all relay UEs that satisfy the lowest link quality threshold and reports it to the network device, 1. If the services provided by each relay UE are similar, the one with the best link quality may be selected; 2. If the relay service demand required by the remote UE is relatively high, for example, large bandwidth or low delay, select a relay UE that can provide such a service, and the link quality is the best among the rears that satisfy the demand. or the one with the strongest ability, or a balance between the two; 3. If the remote UE has a special demand, for example, there is a binding relationship between the relay UE and the relay UE, the typical example is that the user's cell phone and the user's wearable device generally share the mobile fee package, and the fee settlement and service If there is an advantage in the above, measurement reporting can be performed preferentially.

It should be explained that, in the measurement process, in the trigger condition for triggering the measurement report reporting, in the measurement report trigger event between the serving cell, the serving relay UE, other potential cells, and other potential relay UEs, those mentioned in the above example In addition, the measurement result of the serving cell is higher than the threshold; that the measurement result of the serving relay UE is higher than the threshold; that the serving cell has a measurement result lower than the threshold; that the measurement result of the serving relay UE is lower than the threshold; that the measurement result of other potential cells is higher than that of the serving cell measurement result plus the offset; Other potential relay UE's measurement result is higher than the relay UE measurement result plus the offset; other potential cell measurements above the threshold; Other relay measurement results are higher than the threshold; that the measurement result of the serving cell is lower than the threshold 1, and the measurement result of other potential cells is higher than the threshold 2; that the measurement result of the serving cell is lower than the threshold 1, and the measurement result of other potential relay UEs is higher than the threshold 2; that the measurement result of the serving relay UE is lower than the threshold 1, and the measurement result of other cells is higher than the threshold 2; that the measurement result of the serving relay UE is lower than the threshold 1, and the measurement result of other potential relay UEs is higher than the threshold 2; The measurement result of other potential cells of cross RAT (RADIO ACCESS TECHOLOGY, radio access technology) is higher than the threshold; The measurement result of other potential relay UEs of cross RAT is higher than the threshold; that the measurement result of the serving cell is lower than the threshold 1, and the measurement result of other potential cells of the cross RAT is higher than the threshold 2; that the measurement result of the serving cell is lower than the threshold 1, and the measurement result of other potential relay UEs of the cross RAT is higher than the threshold 2; that the measurement result of the serving relay UE is lower than the threshold 1, and the measurement result of other potential cells of the cross RAT is higher than the threshold 2; The measurement result of the serving relay UE is lower than threshold 1, and the measurement result of other potential relay UEs of cross RAT may further include at least one of higher than threshold 2.

Here, the other potential cell of the above-mentioned cross RAT is, for example, an LTE cell, and the other relay UE of the cross RAT is, for example, an LTE V2X UE (only supports LTE PC5/sidelink interface).

It should be noted that the values of each of the thresholds listed above include threshold 1 and threshold 2, both of which may be different, some of which may be the same, some may be different, and the like.

And, in general, the measurement result from the network device is compared with the measurement result from the network device in the same way, and the measurement result from the relay is only compared with the measurement result from the relay UE, and the two are generally directly It does not compare sizes, and only triggers when each threshold requirement is satisfied or the threshold must be satisfied at the same time.

For example, if the measurement result of the serving cell is lower than the threshold and the measurement result between the relay UE and the relay is higher than the threshold, in this case, if the event trigger condition is satisfied, the measurement report reporting is performed. When the network device receives this measurement report, it may switch the UE from the Uu link to the relay link.

Embodiment 2: Switching between the Uu link and the relay link of the common network device (base station)

The embodiment of the present application shows a switching process among the most typical L2 sidelink relay architectures, that is, a switching process between a UE1 <-> gNB1 link and a remote UE1 <-> relay UE2 <-> gNB1 link. Currently, UE1 in the front link and remote UE1 in the back link are the same terminal device, and only have different names in different links.

The switching process provided by the embodiment is as follows.

Step 0: UE1/remote UE1 is connected to gNB1, selects one cell under gNB1 as its serving cell cell1, and establishes an RRC connection between UE1 and cell1.

If UE1 is directly connected to cell1, UE1 may have a plurality of serving cells, for example, a plurality of cells (secondary, Scell) configured in the case of carrier aggregation (CA), in which case cell1 is the main It may be a primary cell (Pcell), or may also be a special cell (spcell).

If it is remote UE1, this means that a connection with cell1 is established through relay UE2, that is, RRC protocol stack counterparts are located in remote UE1 and cell1, respectively, and relay UE2 only performs layer 2 relaying for data. In general, cell1 is also a serving cell of relay UE2, and is also typically a Pcell or spcell of relay UE2. If it is remote UE1, since it is logically connected to gNB1, it is connected to only one cell1, and there is no need to check other Scells of relay UE2.

Step 1: cell1 configures measurement for UE1.

In this example, cell1 may set various combinations of measurements related to the serving cell, other cells, serving relays, and other relays according to the capability/propensity/request of UE1.

For example, if UE1 is directly connected to cell1 and wants to save electricity, or if its transmission/reception capability is limited, or wants to support sidelink relay architecture first, it is relatively effective in the measurement setup that the serving cell is the threshold Reporting is lower and the relay UE is higher than the threshold, and after this condition is satisfied, it is advantageous for gNB1 to switch the UE to the relay link as soon as possible.

For example, UE1 is a remote UE, and based on whether a relay relationship to which it is bound exists, the network side may set different measurement settings. In the configuration, the serving relay UE quality, other potential relay UE quality, serving cell quality and other potential cell quality should be considered, which is advantageous for determining whether the remote UE1 selects an alternative other relay link or a Uu link; If remote UE1 only wants to access a specific relay UE2, only the serving relay quality, serving cell quality, and other cell qualities need to be considered in the measurement configuration, which makes the remote UE1 select the superior one in the relay UE2 and Uu link. advantageous to do

Optionally, in the case of remote UE1, the measurement configuration is relayed through relay UE2. First, cell1 transmits to relay UE2 through Uu interface, and then relay UE2 transmits to remote UE1 through sidelink interface again.

Step 2: If UE1 satisfies the measurement trigger condition, the measurement result is reported to cell1.

The trigger of the measurement generally includes poor link quality of the present node and/or good link quality of other nodes. For example, when UE1 is directly connected to cell1, when the cell1 link quality is lower than the threshold and the relay UE2 reports that the link quality is higher than the threshold, the path that connects UE1 directly to cell1 from the path connected to cell1 through relay UE2 can be switched to Conversely, when remote UE1 is connected to cell1 through relay UE2, if cell1 link quality is higher than the threshold and reports that the link quality of relay UE2 is lower than the threshold, connect UE1 to cell1 directly from the path connected to cell1 through relay UE2 path can be switched.

Optionally, before step 3, cell1 may have to interact with relay UE2, and whether the relay UE2 supports UE1 switching from the direct link to the relay path under relay UE2 from the direct link, after obtaining the confirmation of the relay UE2 again Send reset information/switching command. Of course, this process can be omitted, and remote UE1 and relay UE2 check each other in the measurement step, and only when relay UE2 agrees to accept remote UE1, remote UE1 does not check the measurement result related to relay UE2. report on

Step 3: cell1 sends a first message to UE1.

The first message may be a reconfiguration message, which includes switching information, for example, a new route indication and a setup under a new route.

When UE1 is directly connected to cell1, cell1 switches to UE1 through the first message under relay UE2, and also informs that relay UE2 path related configuration is included. At this time, since the upper layer part of each Data Radio Bearer (DRB) and Signaling Radio Bearer (SRB), that is, RRC/PDCP, is still in cell1, things related to these two layers generally need to be reconfigured. (Of course, it can be reset), the safety operation decides whether to proceed with the safety update process according to the demand, and since some layers of the RLC/MAC/PHY of UE1 are directly connected with the relay UE2, the Of course, logically, further modifications can be made on the previous settings. In addition, it may include some configuration on the sidelink of UE1, and since cell1 relatively knows the service status of UE1, at this time, resources of the sidelink, for example, resource pools or dedicated period resources of a grant, can be directly configured for UE1. .

If remote UE1 is connected to cell1 through relay UE2, cell1 is switched to a path directly connected to cell1 to UE1 through the first message, and informs that a new path configuration is included. Likewise, since the layer 3 part is not altered, and the PDCP/RRC is still anchored to cell1, things associated with these two layers generally do not need to be reconfigured (and of course they can be reconfigured), and the safe operation is on demand. It is decided whether or not to proceed with the safety update process, and since several layers of UE1's RLC/MAC/PHY are directly connected to cell1, it must be reconfigured. . In addition, it may include some configuration on the Uu link of UE1, and since cell1 relatively knows the service status of UE1, at this time, resources of the Uu link, for example, a dedicated period resource of a grant, can be directly configured for UE1.

Optionally, before step 3, cell1 transmits a second message (eg, may be a reconfiguration message) to relay UE2, which may further include the step of including route information and configuration information about the remote UE1. .

If UE1 is directly connected to cell1, cell1 should switch remote UE1 to relay UE2 through the second message, configure sidelink settings for relay UE2, communicate with remote UE1, and relay UE2 Set or modify the settings of the Uu interface for this purpose, and inform that the data of the remote UE1 should be bearing.

If remote UE1 is connected to cell1 through relay UE2, cell1 should switch remote UE1 to relay UE2 through the second message, and may release sidelink connection with remote UE1, and also for relay UE2 Deletes the configuration of the configured or modified Uu interface, indicating that the resource for bearing the remote UE1 data is released.

Step 4: UE1 receives the first message of cell1, and after connecting to the new node, sends a completion message of the first message (eg, switching completion signaling) to cell1.

If UE1 directly connected to cell1 receives the command to switch to relay UE2, that is, the first message, it starts to establish a bearer with relay UE2 and PC5 RRC, and transmits switching completion signaling to relay UE2 using the related configuration, , this relays to cell1.

When the remote UE1 receives the first message, that is, the first message that the cell1 connected through the relay UE2 is switched to the direct connection cell1, it initiates a random access process to cell1, and transmits the switching completion signaling to cell1 using the Uu interface configuration, relay Release PC5 RRC and bearer with UE2.

Optionally, the method may further include, after the relay UE2 receives the second message of cell1 and performs link change before step 5, transmitting the second message and the completion message to cell1.

If cell1 to which UE1 is directly connected receives a command to switch to relay UE2, i.e., the second message, relay UE2 establishes a bearer with remote UE1 and PC5 RRC, and also uses the related sidelink configuration and Uu configuration of the second message. It sends a completion message (switching completion signaling) to cell1, and also relays signaling and data of relay UE1.

If UE1 receives the command that cell1 connected through relay UE2 switches to direct connection, that is, the second message, relay UE2 blocks the sidelink with remote UE1, and also uses the related Uu configuration modification to complete the second message Send a message (switching completion signaling) to cell1.

Step 5: cell1 receives the switching completion signaling of UE1 (ie, the completion message of the first message). Optionally, cell1 receives the completion message of the second message of the relay UE2, and the overall switching process ends.

Embodiment 3: Switching between the relay link and the relay link of the joint base station

This embodiment shows a process in which a remote UE1 switches between relay UE2 and relay UE3, where the service base stations of relay UE2 and relay UE3 are the same, and cross base station interaction is not required.

The switching process in this embodiment is as follows.

Step 0: The remote UE1 establishes a connection with cell1 first through relay UE2, the layer 3 protocol stack of remote UE1 is anchored to cell1, and relay UE2 relays data through the L2 protocol stack.

Step 1: cell1 configures measurement for remote UE1.

In this embodiment, remote UE1 may be one open UE, or both relay UE2 and relay UE3 may belong to its desired connection device. The measurement configuration information may include link quality for measuring the serving relay UE2, link quality for measuring Uu (this serving cell cell1 and other cells), and link quality for measuring other potential relay UEs (including relay UE3).

Step 2: Trigger a measurement event, and the remote UE1 reports the measurement result.

Optionally, the measurement event in this embodiment is that the link quality of the serving relay UE2 is lower than the threshold, and/or the link quality of the latent relay UE3 is higher than the threshold, and/or the link quality of the serving relay UE2 is the potential relay UE3 It is lower than the link quality of , plus the offset.

Optionally, before step 3, cell1 can interact with relay UE3, for example, ask relay UE3 whether UE1 supports switching from relay UE2 to relay UE3, and obtain confirmation of relay UE3. Then, the first message is sent again. Of course, this process can be omitted, and the remote UE1 and relay UE3 check each other in the measurement step, and only when the relay UE3 agrees to accept the remote UE1, the remote UE1 does not check the measurement result related to the relay UE3. report on

Step 3: cell1 sends a first message to remote UE1 to inform remote UE1 to switch to relay UE3.

The first message may include a bearer or layer 3 setup update, and generally may not update, indicating whether to update the safety operation because there is no change, and include it in the sidelink setup of the new link.

Optionally, before step 4, cell1 transmits a second message (eg, a reconfiguration message) to relay UE2 to inform the remote UE1 that it needs to be switched from relay UE2.

The second message includes resetting the relay UE2 Uu interface, for example, deleting some DRBs, or deleting a data stream mapped to some DRBs, deleting settings related to remote UE1 transmission, etc., as well as sidelink Instructs the release of resources and settings.

Optionally, before step 4, cell1 transmits a second message to relay UE3 to inform the remote UE1 that it should be switched to relay UE3.

The second message includes resetting the relay UE3 Uu interface, for example, adding or modifying some DRBs, or adding a data stream mapped to some DRBs, and adding settings related to remote UE1 transmission. , and also indicates sidelink resource allocation and configuration.

Step 4: The remote UE1 receives the first message, releases the PC5 RRC connection with the source relay UE2, establishes the target relay UE3 and PC5 RRC, establishes with the corresponding data bearer, and completes the first message with cell1 Send a message (switching completion message).

Optionally, after receiving the second message, the relay UE2 releases the PC5 RRC connection with the remote UE1, performs Uu interface bearer change configuration according to the new configuration, and then sends the completion message of the second message to cell1 .

Optionally, after receiving the second message, the relay UE3 establishes a PC5 RRC connection and bearer with the remote UE1, performs Uu interface bearer change change according to the new configuration, and then completes the second message to cell1. to send

Step 5: cell1 receives the completion message of the remote UE1. Optionally, it receives the completion message of the relay UE2 and the completion message of the relay UE3, and considers that the switching process is complete.

Embodiment 4: Switching between Uu link and relay link of cross base station

This embodiment is similar to Embodiment 2, and shows switching between a Uu link and a relay link. If the difference is that the source path and the target path of Embodiment 2 are both under the same base station control, this embodiment is a cross base station scenario. consider

In this embodiment, parts similar to those of Embodiment 2 were omitted at the time of introduction, and the points different from Embodiment 2 were mainly described, and the switching steps are as follows.

Step 0: UE1 is directly connected to cell1 under gNB1 or connected via relay UE2.

Step 1: cell1 configures measurement for UE1.

In this embodiment, the measurement configuration for UE1 does not include or limit measurement of other potential cells/base stations, or relay UEs under adjacent cells/adjacent base stations.

Step 2: UE1 triggers measurement reporting, and reports the measurement result to cell1.

In this measurement result, it generally includes a cell of an adjacent base station or a relay UE under the adjacent base station. For example, the remote UE1 located at the edge of the cell has poor relay link, for example, the sidelink quality is lower than the threshold, and the link quality of the cell2 below the neighboring gNB2 from the UE1 is higher than the threshold; Alternatively, for UE1 directly connected to cell1 located at the edge of the cell, the present cell link quality is lower than the threshold, and the link quality between the UE1 and the relay UE2 under cell2 of the neighboring cell gNB2 is higher than the threshold.

Step 3: cell1 (below gNB1) decides to switch UE1 under the neighboring base station gNB2, and initiates a switching request to the neighboring base station via the Xn interface between base stations (interface between NR base stations) or the X2 interface (interface with the LTE base station) do.

The switching request generally includes settings under the source cell of UE1, service conditions, measurement results, etc., and is transmitted by gNB1 to gNB2.

Step 4: Upon receiving the switching request information included in the base station interface message sent by the gNB1, the gNB2 proceeds with an acceptance decision and setup, and returns the setup information under the new link to the gNB1.

If what UE1 wants to connect to is cell2 under gNB2, gNB2 directly decides.

If UE1 wants to connect to relay UE2 under cell2 of gNB2, before determining, optionally, gNB2 first proceeds with confirmation with relay UE2, and after receiving confirmation, returns a switching acceptance result and configuration, etc.; Or, by default, if the previous UE1 and UE2 have performed sidelink measurement, and have already interacted with each other, information that can support each other relay, and UE2 reported by UE1 included in the measurement report, then the capability and intention of UE2 have already been confirmed, and if so, here There is no need to confirm the opinion of UE2, and gNB2 can decide and configure it directly.

In this embodiment, the configuration information returned by the gNB2 to the gNB1 mainly includes one of the following 1) and 2). 1) If UE1 accesses cell2 under gNB2, it mainly includes configuration to connect to Uu, for example, related bearer configuration and protocol layer configuration, PDCP/RLC/MAC/PHY, etc.; At this time, since cells under other base stations serve for the UE, various configuration changes may exist. 2) if UE1 accesses relay UE2 under cell2 of gNB2, it mainly includes bearer-related configuration and sidelink interface configuration and resources; In addition, it is also necessary to determine the configuration for relay UE2, and it mainly bears the data of the remote UE1, including sidelink interface configuration and resources, and Uu interface bearer addition and change.

Optionally, before step 5, cell2 under gNB2 transmits a second message (eg, a reconfiguration message) to relay UE2 to perform sidelink interface configuration with UE1, resource configuration, Uu interface change, and the like; The method may further include, after the UE2 performs configuration using the second message, returning a completion message of the second message to cell2.

Step 5: gNB1 receives the switching accept message and setup message returned by gNB2, organizes it into a first message, and cell1 sends it to UE1.

Step 6: UE1 receives the message, disconnects the source connection, proceeds to connect to the new target node, and returns a completion message to the new serving cell cell2 using the new configuration.

If switching from the source relay link to direct access cell2, delete the original relay and sidelink connection, and connect to cell2 in a random access process using the new configuration.

When switching from the source cell1 link to cell2 connected by relay UE2, a sidelink link with relay UE2 is established using the new configuration, and a completion message is returned to cell2 through relay UE2.

Step 7: cell2 receives the completion message of UE1. Optionally, it receives the completion message of relay UE2, and considers that the switching is successful and the switching is completed.

Embodiment 5: Switching between relay link and relay link of cross base station

This embodiment shows a process in which remote UE1 is switched from relay UE2 under gNB1 to relay UE3 under gNB2. The switching process is as follows.

Step 0: remote UE1 connects to cell1 under gNB1.

Step 1: cell1 configures measurement for remote UE1.

The measurand may include various measurements of adjacent cells and measurements of relay UEs under adjacent cells.

Step 2: The remote UE1 triggers a measurement event, and performs measurement reporting to cell1.

In this embodiment, the possible measurement reporting result is that the link quality from the remote UE1 to the relay UE2 is lower than the threshold, and/or the link quality from the remote UE1 to the relay UE3 is higher than the threshold, and the relay UE3 is the base station/cell includes information pertaining to

Step 3: cell1 decides to switch remote UE1 from relay UE2 to relay UE3 under the adjacent gNB2, gNB1 sends an interface message and bearer switching request information to gNB2, including source cell configuration and service information of UE1 do.

Step 4: gNB2 receives the switching request message, proceeds with acceptance and configuration information generation, and returns acceptance success and configuration information to gNB1.

Optionally, gNB2 may perform signaling interaction with relay UE3 to inquire whether to agree to remote UE1 access, and only succeeds in accepting after confirmation.

Optionally, before step 5, cell2 transmits a second message (eg, a reconfiguration message) to relay UE3, including sidelink configuration and Uu interface update of relay UE3 and remote UE1; After the relay UE3 receives the second message, the method may further include transmitting a completion message of the second message to cell2.

Step 5: Receive cell1 acceptance success and setup information, organize and send a first message to UE1, the first message mainly includes bearer setup, sidelink interface setup and resource setup, etc.

Optionally, cell1 sends a second message to relay UE2, and releases and modifies sidelink configuration and Uu interface configuration related to remote UE1; It succeeds in setting relay UE2 and returns a completion message to cell1.

Step 6: UE1 receives the first message, performs new configuration according to the instruction, releases the previous sidelink connection with relay UE2, establishes a new connection toward relay UE3 and layer 3 configuration with a corresponding bearer, and Transmits completion message to cell2 through relay UE3.

Step 7: cell2 receives UE1's response and UE3's completion message, and considers the switching complete.

Example 6: PDCP/RLC/MAC processing and data forward shifting caused by remote UE switching

Speaking to the remote UE, upon receiving the first message, each layer performs the following operation.

The PDCP layer uses a new setting, and if it is a PDCP reset instruction, it performs a safety reset and a head compression reset, and performs safe operation and head compression after resetting all subsequent data. If the reporting setting is set, a status report is returned to the other end, and an unsuccessful packet is transmitted again according to the status report sent by the other end, and then new data transmission is started. If the received PDCP data recovery instruction is received, perform the corresponding action of data recovery, continue to reset safety and head compression, and return a status report to the other party if the AM sets the status reporting setting, and also According to the transmitted status report, the unsuccessful packet is transmitted again, and then new data transmission is started.

In general, the service cell of the remote UE belongs to different gNBs, and may instruct PDCP reconfiguration to maintain safety isolation between different nodes. If the service cell of the remote UE does not change, or belongs to the same gNB, in principle, it can choose PDCP data recovery, in which case only the data path changes, and the safety continues because the PDCP anchor does not change and is still in cell1/gNB1. However, it is possible to proceed with the safety update process by instructing the PDCP reset.

Once path switching occurs, the RLC layer deletes the RLC entity configuration, deletes all incomplete PDUs/SDUs, uses the new configuration, and starts data transmission again.

The MAC layer deletes and stops settings and timers related to the source link, and uses the new settings again.

The source relay UE deletes all settings and data related to the remote UE.

The new relay UE establishes a new sidelink bearer and configuration for the remote, and modifies the Uu interface configuration, etc.

If what happened to UE1 is switching under one base station, the data anchor still exists under the same gNB, no data forward shifting is required, the gNB proceeds with PDCP reset or data recovery indication as per demand, and state for AM It supports reporting of reports, and performs data reception status feedback and retransmission processes.

If what happened to UE1 is the switching from the source gNB1 to the target gNB2, the data anchor changes, at this time data forward shifting and PDCP SN status transfer are required, gNB1 sends the PDCP SN status to gNB2, and also by negotiation The uplink/downlink data of UE1 should be forward-shifted to gNB2, and transmission should proceed in a new path.

The switching method in the sidelink relay architecture according to the embodiment of the present application has been described in detail with reference to FIG. 1 above. A switching method in a sidelink relay architecture according to another embodiment of the present application will be described in detail with reference to FIG. 2 below. The interaction between the network device and the terminal device described on the network device side is the same as the description on the terminal device side in the method shown in FIG. 1 , and the related description is appropriately omitted to avoid duplication.

2 is a flow chart of implementing a switching method in a sidelink relay architecture of an embodiment of the present application, and may be applied to a network device side. As shown in FIG. 2 , the method 200 includes: S202: sending a first message, wherein the first message includes switching information; The corresponding switching information is for instructing the terminal device to switch from the source link to the target link, and at least one of the source link and the target link is a relay link.

In an embodiment of the present invention, the network device to which the remote terminal belongs may transmit switching information, and the remote terminal performs switching according to the switching information to complete the switching process, thereby securing service continuity, system performance and user experience. further improve

Optionally, as an embodiment, the method further comprises: sending a second message, wherein the second message includes reset information; The reset information is added by the relay terminal to configure the sidelink interface; Delete the settings of the sidelink interface; Instructs to perform at least one of resetting the Uu interface.

Optionally, as an embodiment, before transmitting the first message, the method includes transmitting a connection request message to the target relay terminal, wherein the request message is for requesting the terminal device to access the target relay terminal step that will; Receiving a response message from the target relay terminal, the response message further includes instructing the terminal device to allow access.

Optionally, as an embodiment, the method further comprises sending a switching request message to the target network device; the switching request message is for requesting a terminal device to switch to a target relay terminal, wherein the target relay terminal is located in a cell provided by the target network device; Alternatively, the switching request message is for requesting the terminal device to switch into a cell provided by the target network device.

Optionally, as an embodiment, the method further comprises: receiving configuration information from the target network device; The setting information may include: Uu setting of the target network device; bearing related settings of the target network device; setting a sidelink interface of the target relay terminal; and at least one of sidelink resource settings of the target relay terminal.

Optionally, as an embodiment, the method further comprises: transmitting measurement setting information; The measurement setting information is for instructing the terminal device to proceed with measurement reporting.

A switching method in a sidelink relay architecture according to another embodiment of the present application will be described in detail with reference to FIG. 3 below. The description of the relay terminal is the same as that of the terminal device in the method shown in FIG. 1 , and the related description is appropriately omitted to avoid duplication.

3 is a flowchart illustrating a switching method in a sidelink relay architecture according to an embodiment of the present application, and may be applied to a relay terminal side. As shown in FIG. 3 , the method 300 includes the following steps.

S302: Receive a second message from the network device, the second message including reset information;

S304: add setting of sidelink interface according to the reconfiguration information; Delete the settings of the sidelink interface; Perform at least one of resetting the Uu interface.

In an embodiment of the present invention, the network device to which the remote terminal belongs may transmit switching information, and the remote terminal performs switching according to the switching information to complete the switching process, thereby securing service continuity, system performance and user experience. further improve

Optionally, as an embodiment, the method includes: receiving a connection request message from the network device, the request message for requesting the terminal device to connect; Transmitting a response message, the response message further comprising instructing the terminal device to allow access.

Optionally, as an embodiment, the method includes: establishing an RRC connection between a terminal device and a PC5 interface and a bearing of the PC5 interface; The method further includes sending a completion message of the second message to the network device.

Optionally, as an embodiment, the method includes: releasing the RRC connection of the PC5 interface with the terminal device and the bearing of the PC5 interface; The method further includes sending a completion message of the second message to the network device.

The switching method in the sidelink relay architecture according to the embodiment of the present application has been described in detail with reference to FIGS. 1 to 3 above. A terminal device according to an embodiment of the present application will be described in detail with reference to FIG. 4 below.

4 is a structural schematic diagram of a terminal device according to an embodiment of the present application. As shown in FIG. 4 , the terminal device 400 receives a first message from the network device, wherein the first message includes a receiving module 402 including switching information; and a link switching module 404 that switches from a source link to a target link according to the switching information, wherein at least one of the source link and the target link is a relay link.

In an embodiment of the present invention, the network device to which the remote terminal belongs may transmit switching information, and the remote terminal performs switching according to the switching information to complete the switching process, thereby securing service continuity, system performance and user experience. further improve

Optionally, as an embodiment, the link switching module 404 is switched from the first relay link to the first Uu link according to the switching information; or switching from the second Uu link to the second relay link according to the switching information; or switching from the third relay link to the fourth relay link according to the switching information; wherein the first relay link and the first Uu link belong to the same network node or to different network nodes; the second relay link and the second Uu link belong to the same network node or to different network nodes; The third relay link and the fourth relay link belong to the same network node or to different network nodes.

Optionally, as an embodiment, the terminal device 400 further includes a sending module for transmitting a completion message for the first message.

Optionally, as an embodiment, the receiving module 402 receives measurement setting information; Measurement reporting is performed according to the measurement setting information.

Optionally, as an embodiment, the measurement configuration information includes: signal quality of a serving cell by the terminal device; signal quality of a potential cell other than the serving cell link quality with a relay terminal of the current service; At least one of link quality with a potential relay terminal is measured.

Optionally, as an embodiment, the measurement configuration information is for instructing the terminal device to measure link quality with the potential relay terminal, and the receiving module 402 receives a broadcast message from the potential relay terminal. , the broadcast message is for instructing the potential relay terminal to support providing a relay service; and/or the terminal device 400 transmits a request message, the request message further comprising a sending module for requesting a relay terminal providing a relay service; The reception module 402 receives a response message from the potential relay terminal, and the response message is for instructing the potential relay terminal to support providing a relay service.

Optionally, as an embodiment, measuring the link quality with the potential relay terminal includes: the broadcast message; the request message; the response message; and measuring link quality with the potential relay terminal according to at least one of the reference signals from the potential relay terminal.

Optionally, as an embodiment, there are a plurality of potential relay terminals, and the reported potential relay terminal includes: a potential relay terminal having the best link quality among the plurality of potential relay terminals; a potential relay terminal capable of providing a preset service request; It is a potential relay terminal in which a relationship with the terminal device has been established.

Optionally, as an embodiment, the performing measurement reporting according to the measurement configuration information may include: that a measurement result of the serving cell or the relay terminal currently serving is higher than a first threshold; that the measurement result of the serving cell or the relay terminal currently serving is lower than a second threshold; that the measurement result of the potential relay terminal is higher than that of adding an offset to the measurement result of the relay terminal currently serving; that the measurement result of the potential cell or the potential relay terminal is higher than a third threshold; that the measurement result of the serving cell is lower than the fourth threshold, and the measurement result of the potential relay terminal is higher than the fifth threshold; a measurement result of the relay terminal currently serving is lower than a sixth threshold, and a measurement result of the potential relay terminal or the potential cell is higher than a seventh threshold; that the measurement result of the potential cell of the cross radio access technology (RAT) or the potential relay terminal of the cross RAT is higher than an eighth threshold; that the measurement result of the serving cell is lower than the ninth threshold, and the measurement result of the cross-RAT potential relay terminal is higher than the tenth threshold; If the measurement result of the relay terminal currently serving is lower than the eleventh threshold, and the measurement result of the potential relay terminal of the cross RAT or the potential cell of the cross RAT satisfies at least one of higher than the twelfth threshold, reporting includes proceeding.

Optionally, as an embodiment, the receiving module 402 receives PDCP resetting indication information; According to the PDCP reset indication information, a safety reset and a head compression reset are performed.

Optionally, as an embodiment, the receiving module 402 receives PDCP recovery indication information; According to the PDCP recovery indication information, a related operation of data recovery is performed.

Optionally, as an embodiment, if the status reporting function is set in the affirmative mode (AM), the terminal device sends a first status report; The method further includes a transmitting module configured to re-transmit a packet that has not been successfully transmitted in the source link according to the received second status report.

Optionally, as an embodiment, the terminal device deletes the RLC entity configuration; Deleting the MAC layer and source link correlated settings; The MAC layer and the source link further include a processing module to perform at least one of stopping a correlated timer.

The terminal device 400 according to the embodiment of the present application may refer to the flow of the method 100 of the corresponding embodiment of the present application, and also each unit/module in the terminal device 400 and the other operations and/or Or each function implements a corresponding process in the method 100, and can also achieve the same or equivalent technical effect, and for the sake of brevity, a detailed description is omitted here.

5 is a structural schematic diagram of a network device according to an embodiment of the present application. 5 , the network device 500 transmits a first message, the first message including a sending module 502 including switching information; The switching information is for instructing the terminal device to switch from a source link to a target link, and at least one of the source link and the target link is a relay link.

In an embodiment of the present invention, the network device to which the remote terminal belongs may transmit switching information, and the remote terminal performs switching according to the switching information to complete the switching process, thereby securing service continuity, system performance and user experience. further improve

Optionally, as an embodiment, the sending module 502 sends a second message, wherein the second message includes reset information; The reset information is added by the relay terminal to configure the sidelink interface; Delete the settings of the sidelink interface; Instructs to perform at least one of resetting the Uu interface.

Optionally, as an embodiment, the sending module 502 sends a connection request message to the target relay terminal, wherein the request message is for requesting the terminal device to access the target relay terminal; The network device 500 receives a response message from the target relay terminal, and the response message further includes a receiving module instructing to allow the terminal device to access.

Optionally, as an embodiment, the sending module 502 sends a switching request message to the target network device; the switching request message is for requesting a terminal device to switch to a target relay terminal, wherein the target relay terminal is located in a cell provided by the target network device; Alternatively, the switching request message is for requesting the terminal device to switch into a cell provided by the target network device.

Optionally, as an embodiment, the network device 500 further includes a receiving module for receiving configuration information from the target network device; The setting information may include: Uu setting of the target network device; bearing related settings of the target network device; setting a sidelink interface of the target relay terminal; and at least one of sidelink resource settings of the target relay terminal.

Optionally, as an embodiment, the sending module 502 sends measurement setting information; The measurement setting information is for instructing the terminal device to proceed with measurement reporting.

The network device 500 according to the embodiment of the present application may refer to the flow of the method 200 of the corresponding embodiment of the present application, and also each unit/module in the corresponding network device 500 and the other operations and/or Alternatively, each function implements a corresponding process in the method 200, and may achieve the same or equivalent technical effect, and for the sake of simplicity, a detailed description will be omitted herein.

6 is a structural schematic diagram of a terminal device according to an embodiment of the present application. As shown in FIG. 6 , the terminal device 600 receives a second message from the network device, wherein the second message includes a receiving module 602 including reset information; adding a setting of a sidelink interface based on the reset information; Delete the settings of the sidelink interface; and a settings update module 604 for performing at least one of resetting the Uu interface.

In an embodiment of the present invention, the network device to which the remote terminal belongs may transmit switching information, and the remote terminal performs switching according to the switching information to complete the switching process, thereby securing service continuity, system performance and user experience. further improve

Optionally, as an embodiment, the receiving module 602 receives a connection request message from the network device, wherein the request message is for requesting the terminal device to connect; The terminal device 600 transmits a response message, and the response message further includes a transmission module instructing to allow the terminal device to access.

the terminal device 600 establishes the RRC connection of the terminal device and the PC5 interface and the bearing of the PC5 interface; and a sending module for sending a completion message switching completion signaling of the second message to the network device.

the terminal device 600 releases the RRC connection of the PC5 interface with the terminal device and the bearing of the PC5 interface; and a sending module for sending a completion message switching completion signaling of the second message to the network device.

The network device 600 according to the embodiment of the present application may refer to the flow of the method 300 of the corresponding embodiment of the present application, and also each unit/module in the network device 600 and the other operations and/or Alternatively, each function implements a corresponding process in the method 300 , and may achieve the same or equivalent technical effect, and for the sake of simplicity, a detailed description will be omitted herein.

Each embodiment of the present specification has been described using a gradual method, and what has been mainly described in each embodiment is usually different from other embodiments, and the same or similar parts between the embodiments may be cross-referenced. With respect to the apparatus embodiment, since the method embodiment is similar thereto, the description is relatively simple, and for related parts, reference may be made to some description of the method embodiment.

7 is a block diagram of a terminal device according to another embodiment of the present application. The terminal device 700 illustrated in FIG. 7 includes at least one processor 701 , a memory 702 , at least one network interface 704 , and a user interface 703 . Each module in the terminal device 700 is connected together via a bus system 705 . The bus system 705 implements the connection communication between these modules. In addition to including a data bus, the bus system 705 also includes a power bus, a control bus and a status signal bus, and the like. However, for the sake of clarity, in FIG. 7 , each bus is denoted by a bus system 705 .

Among them, the user interface 703 includes a display, a keyboard, a clicking device (eg, a mouse, a trackball), a touch pad or a touch screen, and the like.

It will also be understood that the memory 702 in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both a volatile memory and a non-volatile memory. Among them, non-volatile memory is read-only memory (ROM), programmable memory (Programmable ROM, PROM), volatile programmable memory (Erasable PROM, EPROM), electrically volatile programmable memory (EPROM, EEPROM) or flash can be The volatile memory may be random access memory (RAM), which is used as an external high-speed cache. By way of example but not limitation, many types of RAM may be used, for example, Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM). , Double Data Rate SDRAM (DDR SDRAM), Enhanced Synchronized Dynamic RAM (ESDRAM), Synchronized Link Dynamic RAM (SLDRAM) and Direct Rambus RAM (DR RAM). . The first memory 702 of the systems and methods described in the embodiments of the present application is intended to include, but is not limited to, these and any other suitable type of memory.

In some implementations, the memory 702 stores the following elements: an operating system 7021 and an application 7022 that are executable modules or data structures or subsets or supersets thereof.

Among them, the operating system 7021 implements various basic services, including various system programs, for example, a framework layer, a core library layer, a drive layer, and the like, and also processes a hardware-based task. The application 7022 implements various application services including various programs, for example, a media player, a browser, and the like. The program of the method of the embodiment of the present application may be included in the application program 7022 .

In the embodiment of the present application, the terminal device 700 also includes a computer program stored in the memory 702 and executable by the processor 701, and when the computer program is executed by the processor 701, the following method embodiment Steps (100 and 300) are implemented.

The method disclosed in the embodiment of the present application may be applicable to the processor 701 or may be implemented by the processor 701 . The processor 701 may be an integrated circuit chip and has a signal processing capability. In the implementation process, each step of the method may be completed through an integrated logic circuit of hardware in the processor 701 or instructions in the form of software. The processor 701 is a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable It may be a logic element, a discrete gate or transistor logic element, a discrete hardware module, or the like. Each method, step, and logic block diagram disclosed in the embodiments of the present application may be implemented or executed. A general purpose processor may be a microprocessor, and the processor may also be any general processor, or the like. In combination with the steps of the method disclosed in the embodiments of the present application, it may be directly implemented and executed as a hardware decoding processor, or may be completed by executing a combination of hardware and software modules in the decoding processor. A software module may be located in a computer-readable storage medium mature in the art, such as random memory, flash memory, read-only memory, programmable read-only memory or volatile programmable memory, registers, and the like. The computer readable storage medium is located in the memory 702, and the processor 701 reads the information in the memory 702, and combines it with the hardware to complete the steps of the method. Specifically, a computer program is stored in the computer-readable storage medium, and when the computer program is executed by the processor 701, each step of the method embodiments 100 and 300 is implemented.

It will be understood that these embodiments described in the embodiments of the present application may be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. In a hardware implementation, the processing unit may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processing (DSP), Digital Signal Processing Devices (DSP Devices, DSPDs), and Programmable Logic Elements. (Programmable Logic Device, PLD), Field-Programmable Gate Array (FPGA), general-purpose processor, controller, microcontroller, microprocessor, other electronic unit for implementing the above functions of the present application, or a combination thereof. can be

In software implementation, the description of the embodiment of the present application may be implemented through a module (eg, process, function, etc.) implementing the function of the embodiment of the present application. The software code may be stored in a memory and executed by a processor. The memory may be implemented within the processor or external to the processor.

The terminal device 700 may implement each process implemented by the terminal device among the above-described embodiments, and also achieve the same technical effect, and thus a detailed description will be omitted here to avoid duplication.

Referring to FIG. 8 , FIG. 8 is a structural schematic diagram of a network device applied to an embodiment of the present application, which may implement the details of the method embodiment 200 and achieve the same effect. As shown in FIG. 8 , the network device 800 includes a processor 801 , a transceiver 802 , a memory 803 , and a bus interface.

In one embodiment of the present application, the network device 800 also includes a computer program stored in the memory 803 and executable by the processor 801 , when the computer program is executed by the processor 801 , the method execution The steps of example 200 are implemented.

In FIG. 8 , the bus structure may include any number of interconnected buses and bridges, specifically, one or a plurality of processors represented by the processor 801 and various circuits of the memory represented by the memory 803 . connected together The bus structure may also connect various other circuits together, for example, peripheral devices, voltage regulators and power management circuits, all of which are common knowledge in the art, so a detailed description thereof will not be proceeded in this text. A bus interface provides an interface. The transceiver 802 may be a plurality of elements, ie, it provides a unit that includes a transmitter and a receiver and provides communication with various other devices over a transmission medium.

The processor 801 is responsible for bus frames and normal management, and the memory 803 can store data used by the processor 801 when performing an operation.

Embodiments of the present application also provide a computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, one of the method embodiments 100, 200 and 300 Each process of any one method embodiment is implemented and also achieves the same technical effect, and detailed description will be omitted here to prevent duplication. Among them, the computer-readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

It should be noted that, in the context of the text, the term "comprises" or any other variant thereof means non-exclusively to include, such that a process, method, article or apparatus comprising a set of elements only includes such elements. rather, it is also intended to include other elements not expressly stated, or elements unique to such a process, method, product, or device. In the absence of further limitations, an element defined by the phrase "comprising a..." excludes inclusion of other identical elements as well in a process, method, article, or apparatus incorporating the element. I never do that.

Through the description of the embodiment, those skilled in the art can see that the method of the embodiment can be implemented in the form of adding a general-purpose hardware platform required for software, and of course, it can be implemented through hardware, Among many cases, the former is a more preferred embodiment. Based on this, the essential part of the technical solution of the present application or the part contributing to the prior art can be implemented in the form of a software product, and the computer software product is a storage medium (eg, ROM/RAM, magnetic disk, may be stored in the optical disk), and some commands may be included to cause the terminal (which may be a mobile phone, a computer, a server, an air conditioner or a network device, etc.) to implement the method of each embodiment of the present application.

Although the embodiment of the present application has been described in conjunction with the drawings above, the present application is not limited to the specific embodiment, and the specific embodiment is merely illustrative and not restrictive, and those skilled in the art If the spirit and claims of the present application do not deviate from the scope of protection under the hint of , many more forms can be implemented, and they will all fall within the protection scope of the present application.

Claims (29)

executed by the terminal device,
receiving a first message from a network device, the first message including switching information;
switching from a source link to a target link according to the switching information, wherein at least one of the source link and the target link is a relay link; A switching method in a sidelink relay architecture that includes. According to claim 1,
Switching from the source link to the target link according to the switching information includes:
switching from a first relay link to a first Uu link according to the switching information; or
switching from a second Uu link to a second relay link according to the switching information; or
switching from the third relay link to the fourth relay link according to the switching information;
the first relay link and the first Uu link belong to the same network node or to different network nodes; the second relay link and the second Uu link belong to the same network node or to different network nodes; and the third relay link and the fourth relay link belong to the same network node or to different network nodes. According to claim 1,
After switching from the source link to the target link,
The method of switching in a sidelink relay architecture further comprising sending a completion message for the first message. According to claim 1,
Before receiving the first message from the network device,
receiving measurement setting information;
The switching method in the sidelink relay architecture further comprising; performing measurement reporting according to the measurement configuration information. 5. The method of claim 4,
The measurement setting information is the terminal device,
signal quality of the serving cell;
signal quality of potential cells other than the serving cell;
link quality with the relay terminal of the current service;
A switching method in a sidelink relay architecture for instructing to measure one of link quality with a potential relay terminal. 6. The method of claim 5,
The measurement configuration information is for instructing the terminal device to measure link quality with the potential relay terminal, and before performing measurement reporting according to the measurement configuration information,
receiving a broadcast message from the potential relay terminal, wherein the broadcast message is for instructing the potential relay terminal to support providing a relay service; and/or
transmitting a request message for requesting a relay terminal providing a relay service; and receiving a response message from the potential relay terminal, wherein the response message is for instructing the potential relay terminal to support providing a relay service. 7. The method of claim 6,
Measuring the link quality with the potential relay terminal comprises:
the broadcast message;
the request message;
the response message;
and measuring a link quality with the potential relay terminal according to one of the reference signals from the potential relay terminal. 7. The method of claim 6,
The potential relay terminal is a plurality, and the reported potential relay terminal is among the plurality of potential relay terminals,
A potential relay terminal with the best link quality;
a potential relay terminal capable of providing a preset service request;
A switching method in a sidelink relay architecture that is a potential relay terminal having a relationship established with the terminal device. 6. The method of claim 5,
The step of performing measurement reporting according to the measurement setting information,
that the measurement result of the relay terminal of the serving cell or the current service is higher than a first threshold;
that the measurement result of the relay terminal of the serving cell or the current service is lower than a second threshold;
that the measurement result of the potential relay terminal is higher than that of the current service plus an offset to the measurement result of the relay terminal;
that the measurement result of the potential cell or the potential relay terminal is higher than a third threshold;
that the measurement result of the serving cell is lower than the fourth threshold, and the measurement result of the potential relay terminal is higher than the fifth threshold;
that the measurement result of the relay terminal of the current service is lower than a sixth threshold, and that the measurement result of the potential relay terminal or the potential cell is higher than a seventh threshold;
that the measurement result of the potential cell of the cross radio access technology (RAT) or the potential relay terminal of the cross RAT is higher than an eighth threshold;
that the measurement result of the serving cell is lower than the ninth threshold, and the measurement result of the cross-RAT potential relay terminal is higher than the tenth threshold;
If the measurement result of the relay terminal of the current service is lower than the eleventh threshold, and the measurement result of the potential relay terminal of the cross RAT or the potential cell of the cross RAT satisfies at least one of those higher than the twelfth threshold, reporting A method of switching in a sidelink relay architecture comprising the steps of: proceeding. According to claim 1,
receiving packet data convergence protocol (PDCP) reset indication information;
The switching method in a sidelink relay architecture further comprising: performing operations of safety reset and head compression reset according to the PDCP reset indication information. According to claim 1,
receiving PDCP recovery indication information;
According to the PDCP recovery indication information, performing a data recovery related operation; The switching method in the sidelink relay architecture further comprising a. 12. The method of claim 10 or 11,
If the check mode (AM) has set the status reporting function,
sending a first status report;
The switching method in a sidelink relay architecture further comprising the step of re-transmitting a packet that has not been successfully transmitted in the source link according to the received second status report. According to claim 1,
deleting a radio link control (RLC) entity setting;
deleting a configuration in which a medium access control (MAC) layer and the source link are correlated;
The method of switching in a sidelink relay architecture further comprising at least one of stopping a timer associated with the MAC layer and the source link. run by network devices,
sending a first message comprising switching information;
The switching information is for instructing a terminal device to switch from a source link to a target link, and at least one of the source link and the target link is a relay link. 15. The method of claim 14,
sending a second message including reset information;
The reset information is a relay terminal,
Added setting of sidelink interface;
Delete the settings of the sidelink interface;
A switching method in a sidelink relay architecture for instructing to perform one of the resetting of the Uu interface. 15. The method of claim 14,
Before sending the first message,
transmitting an access request message to the target relay terminal, wherein the request message is for requesting a terminal device to access the target relay terminal;
and receiving a response message from the target relay terminal, wherein the response message indicates that the terminal device is permitted to access. 15. The method of claim 14,
sending a switching request message to the target network device;
the switching request message is for requesting a terminal device to switch to a target relay terminal, wherein the target relay terminal is located in a cell provided by the target network device; or
and the switching request message is for requesting the terminal device to switch into a cell provided by the target network device. 18. The method of claim 17,
The method further includes receiving configuration information from the target network device;
The setting information is
setting Uu of the target network device;
bearing related settings of the target network device;
setting a sidelink interface of the target relay terminal;
A switching method in a sidelink relay architecture comprising at least one of sidelink resource configuration of the target relay terminal. 15. The method of claim 14,
The method further comprises transmitting measurement setting information; The measurement configuration information is for instructing the terminal device to proceed with measurement reporting. executed by the relay terminal device,
receiving a second message from the network device, the second message including reset information;
Based on the reset information,
Added setting of sidelink interface,
Delete the settings of the sidelink interface,
A switching method in a sidelink relay architecture comprising: performing at least one of resetting the Uu interface. 21. The method of claim 20,
receiving a connection request message from the network device, wherein the request message is for requesting the terminal device to connect;
The switching method in a sidelink relay architecture further comprising; transmitting a response message indicating allowing the terminal device to access. 21. The method of claim 20,
establishing the RRC connection between the terminal device and the PC5 interface and the bearing of the PC5 interface;
The switching method in the sidelink relay architecture further comprising; sending a completion message of the second message to a network device. 21. The method of claim 20,
releasing the RRC connection of the PC5 interface with the terminal device and the bearing of the PC5 interface;
The switching method in the sidelink relay architecture further comprising; sending a completion message of the second message to a network device. a receiving module for receiving a first message from a network device, the first message including switching information;
and a link switching module that switches from a source link to a target link according to the switching information, wherein at least one of the source link and the target link is a relay link. a sending module for sending a first message including the switching information;
The switching information is for instructing a terminal device to switch from a source link to a target link, and at least one of the source link and the target link is a relay link. a receiving module for receiving a second message from the network device, the second message including reset information;
Based on the reset information,
Added setting of sidelink interface,
Delete the settings of the sidelink interface,
A terminal device comprising a; a setting update module that performs at least one of resetting the Uu interface. 24. Any one of claims 1 to 13, 20 to 23 comprising a memory, a processor and a computer program stored in the memory and executable by the processor, wherein the computer program is executed by the processor. A terminal device in which a switching method in a sidelink relay architecture according to is implemented. 20. Switching in a sidelink relay architecture according to any one of claims 14 to 19, comprising a memory, a processor and a computer program stored in said memory and executable by said processor, said computer program being executed by said processor. A network device on which the method is implemented. 24. A computer-readable storage medium having stored thereon a computer program that, when executed by a processor, implements the switching method in the sidelink relay architecture according to any one of claims 1 to 23.

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